Tank



FIG. 1 is a top plan view of a tank showing my new design.

FIG. 2 is a rear elevational view thereof.

FIG. 3 is a right side view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a bottom plan view thereof.

FIG. 6 is a front elevational view thereof.

The ornamental design for a tank, as shown and described.